The former Premier League striker would welcome the Owls back to England's top flight.
The Owls, who are guaranteed their highest-placed finish since exiting the Premier League in 2000, will seal a play-off place if they avoid defeat to Cardiff City on Saturday.
And 16 years is far too long an absence according to Hartson - a fan of Cardiff's rivals Swansea City - who admitted he used to love going to Hillsborough in his playing days.
"When I was playing in the Premier League for Arsenal, West ham and Wimbledon, I used to love going to Sheffield Wednesday - there’d be 40,000 there," the former Wales international told the Alan Brazil Sports Breakfast show on Friday.
"It’s a seriously big club. Chris Waddle, David Hirst, Carlton Palmer... these guys. It’s just a great club and they have been away for too long."
Hartson, who arguably enjoyed his best spell at Celtic, commented on another former Bhoys goalscorer, currently on the Owls' books - believing he would relish an opportunity to play in England's top flight.
"Gary Hooper is a player that I watched a lot when he was at Celtic. He’s a goalscorer - a fox in the box," the 41-year-old added.
"If he gets a chance he hits the target and he would relish an opportunity in the Premier League, he never really cut it at Norwich but he would say he never really got any opportunities."
Hooper scored 12 goals to fire Norwich to promotion last season, also via the play-offs, and is one shy of equalling that tally having moved to Hillsborough initially on loan last October.
The 28-year-old has faced criticism of late, having failed to score in his last six appearances.
However, the problem is arguably more to do with the supply than Hooper himself, with the £3 million man managing two attempts on goal in that time - fewer than 11 of his teammates, including defensive trio Glenn Loovens, Tom Leeds and Daniel Pudil.
|Position||Team||Total Scoring Att||Appearances||Mins Played|
|Fernando Forestieri||FW||Sheff Wed||26||7||614|
|Ross Wallace||MF||Sheff Wed||15||6||468|
|Atdhe Nuhiu||FW||Sheff Wed||12||6||184|
|Daniel Pudil||DF||Sheff Wed||8||6||540|
|Barry Bannan||MF||Sheff Wed||7||4||360|
|Tom Lees||DF||Sheff Wed||7||7||630|
|Lucas João||FW||Sheff Wed||7||6||250|
|Aiden McGeady||MF||Sheff Wed||4||5||247|
|Kieran Lee||MF||Sheff Wed||3||7||630|
|Glenn Loovens||DF||Sheff Wed||3||6||476|
|Álex López||MF||Sheff Wed||3||7||481|
|Gary Hooper||FW||Sheff Wed||2||6||426|
|Marco Matias||FW||Sheff Wed||2||4||64|
|Jack Hunt||DF||Sheff Wed||1||6||539|
|Sam Hutchinson||DF||Sheff Wed||1||1||45|
|Liam Palmer||DF||Sheff Wed||1||1||90|
|Vincent Sasso||DF||Sheff Wed||1||1||64|